Missing back teeth: do you need to replace them?

Missing back teeth raise an honest question: do you need to replace them at all? A gap at the back does not show when you smile, and many people manage for years without a molar or two. Some of them never have a problem. Others notice, over time, that food gets stuck, that the teeth near the gap are moving, or that chewing on that side has become awkward. This article explains what actually happens when a back tooth is lost, and how to decide whether to fill the gap.

We are an implant clinic, so you might expect us to say every gap needs an implant. That is not our view. There are good reasons to replace some back teeth, and good reasons to leave others alone.

What back teeth actually do

Your front teeth cut and tear food. The premolars and molars at the back do the grinding. They also hold your bite at the right height, so that the jaws close in the same position each time and the front teeth are not overloaded. When several back teeth are missing, the remaining teeth take more of the force, and the front teeth can start to fan out or wear faster.

Losing one back tooth is very different from losing several. One gap in an otherwise full set of teeth rarely affects chewing much. Two or three missing on the same side often do.

What can happen when a gap is left

Teeth are not fixed in place permanently. They are held in the bone by a ligament and they slowly respond to the forces on them. When a neighbour or an opposite partner is lost, three changes can follow.

Tipping and drifting

The tooth behind the gap, and sometimes the one in front, can lean or drift into the space. A tipped tooth is harder to clean, collects plaque at the gum line on the leaning side, and creates a food trap. It can also make later replacement harder, because there is less room or the angle is wrong.

Over-eruption

The tooth in the opposite jaw, which used to meet the missing tooth, no longer has anything to bite against. Over months and years it can grow slowly down (or up) into the gap. This is called over-eruption. It can expose root surface, cause sensitivity, and interfere with the bite when you move your jaw from side to side. In some cases, the over-erupted tooth has to be shortened or crowned before the gap can be filled.

Bone shrinkage

The jaw bone that held the missing root gradually shrinks, because it is no longer being used. This does not usually cause symptoms. It matters if you later decide on an implant, because less bone may mean a bone graft is needed. In the upper jaw, the sinus above the back teeth can also leave little bone height after a tooth is lost, which is when a sinus lift may be discussed. Our bone graft and sinus lift page explains these.

When leaving a gap is reasonable

Leaving a back gap can be a sensible choice when:

• only one back tooth is missing, especially a last molar right at the back
• you chew comfortably on both sides
• the teeth either side are stable and not tipping
• the opposite tooth is not over-erupting, or is held in place by its own neighbours
• you have plenty of back teeth remaining on both sides to share the load
• your general health or other priorities make treatment less appealing

Some dentists describe a mouth with a full set of front teeth and premolars but fewer molars as a “shortened dental arch,” and many people function well this way, particularly later in life. If you choose to leave a gap, ask your dentist at home to keep an eye on the teeth around it at each check-up. Photos or X-rays a year or two apart will show whether anything is moving.

When replacement is usually worth it

Replacing a missing back tooth is more likely to be worthwhile when:

• chewing on that side is uncomfortable or you avoid it altogether
• two or more back teeth are missing on the same side
• the neighbouring teeth have started to tip or food keeps getting trapped
• the opposite tooth is clearly moving into the gap
• the front teeth are starting to spread or wear because the back support is lost
• you are planning other work, such as crowns, and the gap affects the bite design

Your options for replacing a back tooth

There are three main ways to fill a back gap. The Oral Health Foundation and the NHS describe each of them, and they all have a place.

For a single missing molar with healthy teeth either side, an implant is often the cleaner choice, because it avoids drilling down sound neighbours for a bridge. We prefer to save a healthy tooth rather than crown it. If the teeth either side already have large fillings or old crowns, a bridge can make good sense, since they would benefit from crowns anyway.

What an implant for a back tooth involves

If an implant suits you, the treatment is spread over two trips to Antalya. On the first trip (four hotel nights included) you have an exam and a 3D CBCT scan, and the implant is placed. The bone then needs time to heal around it: about three months in the lower jaw and four to six months in the upper jaw. On the second trip (five hotel nights) the final crown is fitted. Airport and clinic transfers are included; flights are not.

Our published price is £300 per implant, the same whether the brand is MegaGen, Neodent or Straumann, and £450 for an implant with a zirconia crown. If bone grafting is needed, it is £150, and a sinus lift is £350. These are shown on your plan only if the scan shows they are necessary. Every implant patient receives an implant passport and copies of their X-rays and scans. See our dental implants page for more detail, or our full price list.

Several missing back teeth

If many back teeth are missing on both sides, the picture changes. You may be relying on a few remaining teeth or on your front teeth to chew, and that is hard on them. Options then range from two or three implants supporting a small bridge, to a partial denture, to, in some cases, a full-arch solution if the remaining teeth are also failing. A dentist can only advise properly after seeing an X-ray. Our treatments page gives an overview.

Looking after a gap if you leave it

If you decide not to replace a back tooth for now, a few habits help:

• clean the sides of the teeth next to the gap carefully, as these surfaces are now exposed and collect plaque
• use an interdental brush or single-tufted brush along the gum on the gap side
• keep up regular check-ups, and ask your dentist whether any tooth is drifting
• take a photo of the area once a year so you can compare

Choosing not to replace a tooth now does not close the door. If things change, the options are still there, although bone loss over the years can mean extra work later.

Get an honest opinion on your gap

If you are unsure whether a missing back tooth is worth replacing, send us a recent X-ray or a few clear photos. A dentist will look at the gap, the teeth around it and the bone, and tell you in writing whether we think it needs treatment, along with an itemised price if it does. There is no payment needed to get the plan, and “leave it for now” is a perfectly possible answer. Use the contact form or message us on WhatsApp.

Common questions

What happens if I do not replace a missing back tooth?

Often nothing dramatic at first. Over time, the teeth beside the gap can tip into it and the tooth opposite can grow down or up into the space. This can create food traps, change your bite and make later replacement harder.

Is it ever fine to leave a gap?

Yes. If one back tooth is missing, chewing is comfortable, and the neighbouring and opposite teeth are stable, many dentists consider leaving it a reasonable choice. Regular checks help spot any movement.

What is the best way to replace a missing back tooth?

It depends on the teeth either side and the bone. An implant leaves the neighbouring teeth untouched. A bridge works well if the teeth either side already need crowns. A partial denture is the simplest and cheapest, but some people find it bulky.

How much does it cost to replace a back tooth with an implant?

Our published price is £450 for an implant with a zirconia crown. If bone grafting is needed, it is priced separately and shown in your written plan.

Does a missing tooth cause bone loss?

Yes, the jaw bone in a gap gradually shrinks because it no longer supports a root. This matters mainly if you later want an implant, as more bone loss can mean a graft is needed.

Sources

1. Oral Health Foundation: Dental implants
2. Oral Health Foundation: Bridges
3. NHS: Dentures
4. Oral Health Foundation: Cleaning between your teeth

Checked October 2026. Where we give our own view as a clinic, we say so.